Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:

angular separation of the fringes increases.

angular separation of the fringes decreases.

linear separation of the fringes increases.

linear separation of the fringes decreases.

Formulas: In Young's Double Slit Experiment, the linear fringe width (separation) is given by $\beta = \frac{\lambda D}{d}$ , and the angular fringe width (separation) is given by $\theta = \frac{\lambda}{d}$ , where $\lambda$ is the wavelength, $D$ is the distance between the slits and the screen, and $d$ is the distance between the slits.
Analysis: The problem states that the screen is moved away from the slits, which means the distance $D$ increases.
Effect on Linear Separation: Since $\beta \propto D$ , increasing $D$ will cause the linear separation of the fringes ( $\beta$ ) to increase.
Effect on Angular Separation: The angular separation $\theta$ depends only on $\lambda$ and $d$ . It is independent of the screen distance $D$ . Therefore, the angular separation remains constant.
Conclusion: The correct effect is that the linear separation of the fringes increases.

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